After dinner, (Y/n) and the upper moon were having a fun conversation and, teasing (Y/n) by pinching her cheeks and stuff but in the end, they all had a joyful laugh. Suddenly, Muzan entered the room.

The little girl greeted her immediately and approached him "Have you enjoy your dinner?" "Yeah! It was delicious" (Y/n) said cheerfully. "It's time for your bed now. Let's go now"

"Good night everyone!" All of the upper moons greeted back "Have a great sleep, little one"  Douma added while holding his fan. Muzan carried her to the bedroom.

(Y/n) laid down immediately, as soon as they entered. But, Muzan asked her to sit first. "Before you sleep, we are going to discuss something important first. Is that okay, sweetheart?" "Yes, daddy" he smiled at him before he spoke.

"Is it okay for you if you will be having a new mommy?" A moment of silence occurred then finally (Y/n) answered the question.

"Yeah! I also wanted to have a new mother. Sometimes, I cry because I miss my real mommy. If I will be having a new mommy, I would be grateful and if that makes you happy too"

Muzan smiled at her and patted her head, they hugged each other for a while then he spoke another word. "That means you will be meeting her tomorrow"

"Am I having a new mommy tomorrow?! For real?!"

"Yeah! So you have to go to bed now so you can meet her sooner" (Y/n) laid down immediately.

Muzan wrapped her a blanket "Goodnight, sweetheart" he pecked her forehead before leaving the room. Meanwhile, (Y/n) having a hard time falling to sleep due to the excitement. Eventually, she fell asleep soundly after her few giggles.

* * *

The Next Day

Muzan introduced "(Y/n)'s new mommy" to his demons first, especially to the upper demon moons. "I want you to fear and respect her, just the way you are doing to me. I don't care what ranks are you if you do something terrible at her, I will not hesitate to kill you"

After that, they walk to (Y/n)'s room to meet her "Are you excited to meet my daughter?" "Yes, darling" she replied with a smiley face and they held a hand while walking by the hallways.

Muzan opened the door and saw (Y/n) sitting at her study table, playing with her coloring books. "Sweetheart! Sit there" he pointed at the floor and she obeyed, they entered the room. The little girl's eyes sparkled, seeing a beautiful demon-woman with him made her glad.

"So this is your new mommy I was talking about last time. This is Yuzie, Yuzie this is my daughter, (Y/n)"

"Nice to meet you, mommy Yuzie"

"It is nice to meet you too, you are adorable" "Thank you"

Muzan praised them for having a great time for their first encounter. "Now that I also have someone to help taking care of her. I don't have to rely on the upper moons that much now since they have missions too. I'm glad"

"As for you sweetheart, you can treat her like how you did for your biological mother like you wanted to do"

(Y/n) thanked him and she hugged him. She also invited Yuzie, her new mother to their hug as she accepted. "Can I give her a kiss?" the little girl asked. "I don't know, ask her she is your mommy now" she switched her attention to Yuzie with her pleading eyes "Sure! No problem"

She stood up and gave a small peck on the cheeks, Yuzie smiled.

"Now that you are happy with each other. I'll be back later, you two have fun"

Muzan left the room and Yuzie just sitting there for a minute then, she started to act differently. She wiped her cheeks where (Y/n) kissed her and her aura changed.

"Mommy, can we play puzzle?" (Y/n) asked while holding the other pieces of the puzzle. Suddenly, her attitude shifted.

"DON'T YOU DARE TO CALL ME MOMMY, YOU FILTHY HUMAN KID!"  she yelled while pointing at her then she rolled her eyes. "Geez, I don't know why a filthy human kid like you is  Muzan's daughter. It so gross, YOU ARE GROSS" she grabbed a tissue and alcohol from her purse.

She sprayed a lot of portion on her hands and to the tissue then, she wiped her cheeks.

"M-mommy did I do something wrong? But you called me adorable earlier, it means you like me right?" (Y/n)'s tears started to fall on her cheeks.

"Obviously, I was just pretending. He said that he will marry me if I'm nice and act mother then, he will make me his demon queen" Yuzie said cheerfully.

"Then treat me nice genuinely" (Y/n) said. "DON'T TELL ME WHAT TO DO!" she yelled again which made the little girl startled. She stood up and pushed her to the ground that caused a scratch on the little girl's knees.

She cried loudly, she ran away to the door but, Yuzie was way too fast since she's a demon so, she blocked the door before (Y/n) touched it. "No escaping" she grinned.

Yuzie kneeled and tried to fix her dress to cover the scratch and wiped her tears "Stop crying! He will be arriving soon. If he sees you crying he will be mad. If you don't, I will spray you my alcohol in your eyes" the little child stopped crying.

She carried the kid to sat her up in the bed and tried to fix her so, it will not be obvious that she did something to the child and, Muzan arrived.

Usually, when Muzan walked in (Y/n) will greet her cheerfully but she did not. Yuzie pinched (Y/n) signaling that she should act normally. Which she obeyed.

(Y/n) greeted him with a hug and smile but that smile isn't genuine. Then, Muzan noticed the scratch on her knees "What happen to your knees sweetheart? Are you okay?"

"She is okay! It happened when she trips herself while we were playing" Yuzie lied.

"Poor girl, let's treat that! Shall we?"

He sat her on the floor and grabbed the first-aid kit to treat her scratch. Yuzie got envious of the child.

"Daddy, can I play with the upper moons after this?" "Sure"
Yuzie smiled because the child will leave them alone sooner so she can have "quality time" with Muzan like she was thinking of.

As soon as (Y/n) got treated, she ran to the upper moons. The upper moons noticed her sad eyes "What's wrong?" Akaza asked. (Y/n) started to cry out loud. Kokushibo grabbed her water and let her finish before she told everything about her "mommy"

"I knew it! I hate her from the start" Daki said. "Poor little one, I'm sorry that we cannot do anything about it. Your daddy told us that we shouldn't lay a finger on her" Douma said.

"And we cannot tell this to Muzan-sama, he will assume that we are defaming her. Why won't you tell him about this" Akaza asked.

"Because I am scared and he looks like he loves her so, I don't think daddy will believe me. Besides, I am just a filthy human being" (Y/n) replied while looking down.

"You are not filthy, don't listen to her okay?" Daki said. All of them hugged her except for Nakime who was playing her Biwa to help her to calm down.

* * *

The next following day, Yuzie became like that. Acting nice when Muzan is around then mistreated her as soon as he leaves. One time, Muzan was gone for a week and Yuzie mistreated her worse.

She doesn't feed her well enough, slapping her and hitting her with or without reason and prohibited her from meeting her best friend friend, Kuroo and she called him "disgusting"

"Kuroo is not disgusting, YOU ARE!" And she received another hit from her.

There was a time that Douma and Daki went to (Y/n)'s room to ask permission from Yuzie to play with her and also checked her. They noticed that (Y/n) was not in her usual self anymore, she was not smiling or cheerful and they haven't seen that in her for a long time. The upper moons missed her cheerful personality.

Daki and Douma kneeled asking permission. Unfortunately, she didn't agree. Both of them wanted to kill her on the spot they also felt that she was pretty weak than them. But due to Muzan's order, they cannot do anything. They just left and got annoyed.

For the whole week without Muzan, (Y/n) got beaten, haven't eaten properly, got locked in her room, and cried every day and every night. This reminded her of how her uncle mistreated them with her biological mother, it just brought back her miserable days.

One night before she sleeps, she wrapped herself in a blanket while holding a photo of her dead mother

"Mommy, I miss you so much. My new mommy doesn't love me as you do, I guess I don't want to have a new mommy anymore besides you. I hope that you are alive and you are the one who is in her place now" and she cried all night until she fell asleep.

When she fell into a deep sleep, Yuzie slowly entered her room to not wake her up, she was holding a pillow. She tiptoed to her bed and stared at her sleeping figure and noticed the photograph she was holding, she grabbed it "So this is your real mother? Eww" then ripped it off.

She grabbed the pillow then slowly placing it on her head to suffocate her but, a familiar voice called her, she looked from the door her eyes widened it was Muzan. "You're home, I thought you will be gone for a week" she whispered but heard enough.

"I finished my works quickly because I miss my daughter" he approached her. "What are you doing here?"  he asked.

"Oh! I was just putting another pillow beside her so she will be comfier when she sleeps" she lied.

"That's nice of you. Because of that, I prepared a DATE for us tonight, shall we?" Muzan offered his hand and she gladly accepted. They walked outside.

There was a hill, they sat there and watched the full moon. "Did you two had fun while I was gone?" "Yeah"  they smiled.

Muzan leaned at her eyes and whispered "Nice act, bitch. You are not qualified to be my demon queen if you can't accept my daughter" then he snapped her neck.

He went back and cleaned himself first before went back to (Y/n)'s room. Muzan laid beside her sleeping figure and noticed her tears falling during her sleep.

Muzan wiped it and kissed her cheeks "I am sorry to make you suffer like that" he whispered.

* * *

The Next Morning

(Y/n) woke up with Muzan beside her, "Good Morning, sweetheart" Muzan greeted. She hugged him and cried without saying any word but he understands her. "She's gone now"

"I just realized that I don't need a new mommy just you and the upper moons as my family is enough" (Y/n) wiped her tears and smiled as so as Muzan too.

"You missed your best friend right? You can go visit him today after your breakfast" he said.

They went to the kitchen and (Y/n) greeted the upper moons happily "Aww she is back" Douma said. (Y/n) sat down on the chair as her breakfast served by Kokushibo's cooking which is she missed and she ate it happily.

Then she went to Kuroo's place to play there until night. Muzan was the one who picked her up that night instead of Akaza but, (Y/n) was surprised by his look. "You look like a woman, daddy" she laughed. "Tonight, I will be your mommy" he carried her in his arms.

"You look beautiful than an actual woman" and she laughed again. "You are lucky that you are my daughter" they hang out together the whole night.

Before they went home, they visited (Y/n)'s mother's grave "Hi mommy, how are you there? I am okay now. I'm not sad anymore. I also realize that you are the best mommy I ever had. I love you, mommy" she hugged the grave before they went home.